Quiz- Resonance

Resonance Quiz

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Test your knowledge on Resonance for JEE and NEET.

1. What is resonance?

• The movement of a single electron within a molecule.
• The delocalization of electrons within a molecule or polyatomic ion.
• The formation of a double bond.
• The movement of an atom from one position to another.

2. Resonance structures are:

• Isomers of a compound.
• Hypothetical structures that collectively describe the actual structure of a molecule.
• Real structures that rapidly interconvert.
• Structures that have different arrangements of atoms.

3. Which of the following conditions is necessary for resonance to occur?

• The molecule must have a lone pair of electrons.
• The molecule must have a double bond.
• The molecule must be planar.
• The atoms must have the same position in all resonating structures.

4. Which of the following compounds exhibits resonance?

• $CH_4$
• $H_2O$
• $C_6H_6$ (Benzene)
• $CO_2$

5. The hybrid of all contributing resonance structures is known as the:

• Resonance hybrid
• Canonical form
• Resonating structure
• Isomer

6. The stability of a molecule due to resonance is known as:

• Bond energy
• Resonance energy
• Lattice energy
• Ionization energy

7. Which of the following is a condition for canonical structures to be significant contributors?

• They should have a high charge separation.
• They should have a similar number of covalent bonds.
• The octet of all atoms should be complete, or as complete as possible.
• They should have a different number of lone pairs.

8. The delocalization of $\pi$-electrons is responsible for:

• Isomerism
• Resonance
• Hydrogen bonding
• Polarity

9. Which of the following molecules has a bond order of 1.5 due to resonance?

• $NO_2^-$
• $CO_3^{2-}$
• $SO_4^{2-}$
• $PO_4^{3-}$

10. The resonance energy of a molecule is the difference in energy between:

• The most stable canonical form and the least stable canonical form.
• The most stable canonical form and the resonance hybrid.
• The energy of the most stable canonical structure and the actual energy of the molecule.
• The energy of a single bond and a double bond.

11. Which of the following is a correct rule for drawing resonance structures?

• Atoms can be moved from one position to another.
• The number of lone pairs must remain constant.
• The total number of valence electrons must be the same in all structures.
• All atoms must have a complete octet.

12. How does resonance affect the bond lengths in a molecule?

• It makes all bond lengths unequal.
• It makes single bonds shorter and double bonds longer.
• It causes all bonds to have an intermediate length.
• It does not affect bond lengths.

13. Which of the following is an example of a resonance-stabilized carbocation?

• Methyl carbocation
• Ethyl carbocation
• Benzyl carbocation
• Tertiary butyl carbocation

14. The canonical structures of a molecule differ in the position of:

• Atoms
• Lone pairs only
• Electrons, specifically $\pi$-electrons or lone pairs
• Both atoms and electrons

15. In the carbonate ion ($CO_3^{2-}$), what is the bond order of the carbon-oxygen bonds?

• 1
• 1.33
• 2
• 1.5

16. The bond length of the carbon-carbon bonds in benzene is:

• Equal to a $C-C$ single bond.
• Equal to a $C=C$ double bond.
• Shorter than a single bond but longer than a double bond.
• Varying between single and double bond lengths.

17. Which of the following is NOT a characteristic of a resonance hybrid?

• It has lower energy than any of the canonical forms.
• It is the real structure of the molecule.
• It contains delocalized electrons.
• It is an average of all canonical forms with equal weighting.

18. The stability of a conjugated system is attributed to:

• Inductive effect
• Hyperconjugation
• Resonance
• Steric hindrance

19. In which of the following ions is resonance a major factor in stabilization?

• Sulphide ion ($S^{2-}$)
• Nitrite ion ($NO_2^-$)
• Hydride ion ($H^-$)
• Chloride ion ($Cl^-$)

20. The actual structure of a molecule is a single structure with characteristics of:

• Only the most stable resonating form.
• All canonical forms.
• Only the least stable resonating form.
• None of the above.

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